285142217 has 2 divisors, whose sum is σ = 285142218. Its totient is φ = 285142216.

The previous prime is 285142189. The next prime is 285142219. The reversal of 285142217 is 712241582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 226833721 + 58308496 = 15061^2 + 7636^2 .

It is a cyclic number.

It is not a de Polignac number, because 285142217 - 2²² = 280947913 is a prime.

Together with 285142219, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (285142219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142571108 + 142571109.

It is an arithmetic number, because the mean of its divisors is an integer number (142571109).

Almost surely, 2^285142217 is an apocalyptic number.

It is an amenable number.

285142217 is a deficient number, since it is larger than the sum of its proper divisors (1).

285142217 is an equidigital number, since it uses as much as digits as its factorization.

285142217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8960, while the sum is 32.

The square root of 285142217 is about 16886.1545948152. The cubic root of 285142217 is about 658.1938812389.

Adding to 285142217 its reverse (712241582), we get a palindrome (997383799).

The spelling of 285142217 in words is "two hundred eighty-five million, one hundred forty-two thousand, two hundred seventeen".